Improvement in mining-machines



A. CROMBIE.

MININGMACHINE. I N0.171,470. Patented Dec. 28,1875.

N. PETERS, PHOTQ-LITMQGRAPHER. WASHINGTON, D C

; UNITED STATES ALEXANDER OROMBIE, or w1L INeToN,.ILL11I6Is.

EM TQFEIG IMPROVEMENT IN MINING-MACHINES.

Specification forming part of Letters Patent No. 171,470, dated December28, 1875; application filed I November 15, 1875.

'State of Illinois, have invented certain ImprovementsinMining-Machines, of which the following is a specification:

The nature of myinvention consists in so constructing a machine formining (especially coal) as to cut a channel in the side walls of themine, so it will be easier to quarry and mine out'the coal or othermaterial, the construction and operation of which I will proceed toexplain, reference being bad to the annexed drawings, making apart ofthis speoification, in which- Figure 1 is a vertical sectional view onthe line ac; Fig. 2, a section of the planer a; Fig. 3, a top view of asection of the planer a; Fig. 4, a plan view on the top of the planer a,and Fig. 5 a side elevation of the whole machine.

In the drawings, 13 represents the main frame of the machine, whichrests upon carwheel trucks m, which run on the rails n L.

The frame 13 bears the planer or cutting-wheel" a, lying in'a horizontalposition, as shown in Figs. 1 and 5. The planer or cuttillg wlieel a ispropelled by means of the train of cogs and shafts l 2 4 5 6 7, Fig. l,which receive their motion from engines that may be attached to thecranks t t, two engines being used, so as The cutting-wheel a isprovided with knives c and 0, Figs. 2, 3, 4, which are attached to thewheel both on its outer periphery and on its two sides, as shown inFigs. 4 and .5. The knives e being necessary to enable the cutting wheelto cut its way out in case the machine should travel over unevensurfaces, those on the periphery are a little longer than the thicknessof the cuttingwheel a, so the wheel will not bind. These knives c and care fastened to the cutting-wheel a in dovetails, as shown or they maybe fastened in any other manner desirable. The cutting-wheel a is ofmetal, and made in the shape shown, so its outer rim serves as a sort ofbalance-wheel, to preserve its momentum. g is a guard, so arranged as toprevent the dust and chips from flying into the gearing behind it.

The form and construction of the machine may be varied, so as to conformit to :auyeircumstancesand character of mining. It is very obvious thatby this mode a vastly greater amount of coal or any other substance maybe mined than by any other of the modes generally in use.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is as follows, to wit:

The mining-machine described, in which the cutting-wheel a rests ona'step, s, in the body of the main frame B, 011 whichitrevolves by meansof gearing, as shown, and having in combination with it the dust-shield9, all combined and arranged as and for the purposes set forth.

ALEXANDER GROMBIE.

Witnesses:

THos. H. HUTGHINS, CHAS. W. MUNN.

